Isotonic saline is a solution that contains 0.9% sodium chloride (NaCl) and has an osmolarity similar to body fluids. Its primary purpose is to maintain fluid and electrolyte balance.
Dextrose solution is an intravenous glucose-containing fluid. Common concentrations include 5%, 10%, 20%, 30%, and 50%. The most frequently used in clinical practice are 5% (D5W) and 10%.
Treatment of dehydration
Supporting blood pressure
Replacing fluid and electrolyte losses
Dilution and infusion of IV medications
Management of mild hyponatremia
Providing energy
Treating hypoglycemia (typically 10–20%)
Component of parenteral nutrition
Preventing ketosis (especially during fasting states)
Fluid support (less preferred than isotonic solutions)
Isotonic saline: Contains electrolytes → restores fluid and electrolyte balance.
Dextrose: Contains glucose → provides energy and carbohydrate support.